Here's what rhymes with oscillational.
avocational vocational relational observational rotational vibrational navigational correlational locational subnational variational educational occupational operational conversational informational sensational situational conformational foundational ideational mutational invitational aberrational nonvocational probational gravitational recreational motivational generational gestational inspirational translational associational organizational computational denominational organisational congregational transformational confrontational coeducational nonoperational improvisational noneducational nonoccupational representational intergenerational nondenominational interdenominational nonrepresentational Words that almost rhyme with oscillational
occasional available capable payable attainable ascertainable saleable salable breakable trainable assailable bailable claimable gradable obtainable sustainable insatiable traceable unavailable changeable debatable unattainable unassailable unshakable repayable unbreakable unshakeable unsaleable erasable unsalable resalable incapable unchangeable explainable unobtainable unsustainable inflatable degradable untraceable irreclaimable reclaimable persuadable conveyable nonbreakable irreplaceable maintainable replaceable mistakable embraceable unmistakable inescapable interchangeable biodegradable exchangeable microwavable nonexchangeable noninterchangeable